In message , mike
writes
You can't get documentation.
Mum, you can. Most boards are very similar to the chip-set
manufacturer's reference designs for the chip-set used. There's only so
many ways you can connect the same chips and get a working system.
You can't get parts.
You can. If you know where to look, there are many companies out there
selling chips, either pulls or new.

A 20 MHz scope will let you know if the power supply is working.
And a bunch of other things as well. Remember, most of the chips on the
motherboard run at much lower frequencies than the core and you'd
definitely be able to troubleshoot the on-board peripherals plus the PCI
bus to a lesser extent, although a POST card is probably a good initial
test here.

With the level of experience/equipment suggested by your question
you'd be better off fixing something else.
Or learning on a few old boards to gain a new skill.
mike


--
Clint Sharp